我的系统几天来一直无法正常关闭/重启，一直卡在黑屏上，屏幕上显示戴尔和 ubuntu 徽标。关机的唯一方法是按住电源按钮 5 秒钟。
我尝试了以下问题中提到的解决方案，但没有成功。
journalctl -b -1 -r输出：
Aug 14 10:28:12 Mogador systemd-journald[380]: Journal stopped
Aug 14 10:28:12 Mogador systemd-shutdown[1]: Sending SIGTERM to remaining proce>
Aug 14 10:28:12 Mogador systemd-shutdown[1]: Syncing filesystems and block devi>
Aug 14 10:28:12 Mogador systemd[1]: Shutting down.
Aug 14 10:28:12 Mogador systemd[1]: Reached target System Reboot.
Aug 14 10:28:12 Mogador systemd[1]: Finished System Reboot.
Aug 14 10:28:12 Mogador systemd[1]: systemd-reboot.service: Deactivated success>
Aug 14 10:28:12 Mogador systemd[1]: Reached target Late Shutdown Services.
Aug 14 10:28:12 Mogador systemd[1]: Reached target System Shutdown.
Aug 14 10:28:12 Mogador systemd[1]: Stopped Remount Root and Kernel File System>
Aug 14 10:28:12 Mogador systemd[1]: systemd-remount-fs.service: Deactivated suc>
Aug 14 10:28:12 Mogador systemd[1]: Reached target Unmount All Filesystems.
Aug 14 10:28:12 Mogador kernel: br-db8700e41dbb: port 3(vetha3b8e0d) entered di>
Aug 14 10:28:12 Mogador kernel: device vetha3b8e0d left promiscuous mode
Aug 14 10:28:12 Mogador systemd[1]: Deactivated swap /swapfile.
Aug 14 10:28:12 Mogador systemd[1]: swapfile.swap: Deactivated successfully.
Aug 14 10:28:12 Mogador systemd[1]: Stopped Create System Users.
Aug 14 10:28:12 Mogador systemd[1]: systemd-sysusers.service: Deactivated succe>
Aug 14 10:28:12 Mogador systemd[1]: Stopped Create Static Device Nodes in /dev.
Aug 14 10:28:12 Mogador systemd[1]: systemd-tmpfiles-setup-dev.service: Deactiv>
Aug 14 10:28:12 Mogador systemd[1]: Deactivating swap /swapfile...
Aug 14 10:28:12 Mogador kernel: br-db8700e41dbb: port 2(veth13b5c46) entered di>
Aug 14 10:28:12 Mogador kernel: device veth13b5c46 left promiscuous mode